Percentage Change Formula
The percentage change formula with a clear example. Works for both increases and decreases, with the sign telling you the direction.
Reviewed Jan 15, 2025
Quick answer
Percentage change = (new − old) ÷ old × 100. A positive result is an increase; a negative result is a decrease.
% change = (new − old) ÷ old × 100
Try it
Open full calculatorPercentage Change Calculator
Increase or decrease between two numbers.
Result
—
Fill in the inputs to see your result.
Inputs
Related calculators
Calcxo gives you the answer plus the reasoning behind it.
Reading the result
- Positive number → increase.
- Negative number → decrease.
- 0 → no change.
From 80 to 100
A concrete walkthrough you can follow line by line.
Sales went from 80 units last month to 100 this month.
1. Subtract
100 − 80 = 20
2. Divide by old
20 ÷ 80 = 0.25
3. Multiply by 100
0.25 × 100 = 25%
Result
Sales increased by 25%.